Data Analysis

Data analysis is conducted using the R Software Environment in conjunction with the SGP Package. Broadly, the analysis takes place in 6 steps.

1. prepareSGP
2. analyzeSGP
3. combineSGP
4. summarizeSGP
5. visualizeSGP
6. outputSGP

Because these steps are almost always conducted simultaneously, the SGP Package has wrapper functions abcSGP and updateSGP that "wrap" any or all of the above 6 steps into a single function call and simplify the source code associated with the analysis.

For annual state testing systems like Utah, SGP analyses are conducted each year using a similar script. Links to the annual data analysis scripts and accompanying documentation are provided as follows:

• 2013 SGP Analysis
• 2014 SGP Analysis
• 2015 SGP Analysis